diff --git a/dist/traework-gongwen-skill.zip b/dist/traework-gongwen-skill.zip
index 1a4249b..902f267 100644
Binary files a/dist/traework-gongwen-skill.zip and b/dist/traework-gongwen-skill.zip differ
diff --git a/scripts/verify_gongwen_docx.mjs b/scripts/verify_gongwen_docx.mjs
index e9e01a5..748bf18 100755
--- a/scripts/verify_gongwen_docx.mjs
+++ b/scripts/verify_gongwen_docx.mjs
@@ -165,9 +165,23 @@ if (profile === "formal") {
       check("Upward document number and signer share one row", paragraphs(doc).some((p) => /签发人：/.test(textOf(p)) && /〔|\[|文号|发/.test(textOf(p))), "signer is in the same paragraph row as the document number");
     }
   } else {
-    const preprintedReserveParagraph = /w:line="1" w:lineRule="exact"[\s\S]*?w:snapToGrid w:val="false"[\s\S]*?w:sz w:val="2"/.test(doc);
-    check("Preprinted letterhead reserve", preprintedReserveParagraph, "first-page top reserve is present");
     const preprintedParagraphs = paragraphs(doc);
+    const reserveCandidate = (p) => /w:jc w:val="left"/.test(p)
+      && /w:line="1"/.test(p)
+      && /w:lineRule="exact"/.test(p)
+      && /w:snapToGrid w:val="false"/.test(p)
+      && /w:sz w:val="2"/.test(p)
+      && /<w:t[^>]*> <\/w:t>/.test(p);
+    const reserveIndex = preprintedParagraphs.findIndex(reserveCandidate);
+    const reserveParagraph = reserveIndex >= 0 ? preprintedParagraphs[reserveIndex] : "";
+    const reserveSpacing = reserveParagraph.match(/<w:spacing\b[^>]*>/)?.[0] ?? "";
+    const reserveBefore = Number((reserveSpacing.match(/w:before="(\d+)"/) ?? [])[1]);
+    const reserveBeforeInRange = Number.isFinite(reserveBefore) && reserveBefore >= 0 && reserveBefore <= Math.round((130 - 37) * 56.692913);
+    const priorParagraphsAreFloating = reserveIndex >= 0 && preprintedParagraphs.slice(0, reserveIndex).every((p) => /w:framePr\b/.test(p));
+    const preprintedReserveParagraph = reserveIndex >= 0
+      && priorParagraphsAreFloating
+      && reserveBeforeInRange;
+    check("Preprinted letterhead reserve", preprintedReserveParagraph, "first non-floating body paragraph reserves 37-130 mm paper-top agency-mark space");
     const titleXmlStart = firstTitleIndex < 0 ? doc.length : doc.indexOf(preprintedParagraphs[firstTitleIndex]);
     const preprintedHeaderXml = titleXmlStart < 0 ? doc : doc.slice(0, titleXmlStart);
     check("No red drawing for preprinted letterhead", !/w:color w:val="FF0000"/.test(preprintedHeaderXml), "preprinted mode does not redraw red letterhead or rule");
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index f813d08..cbeb5da 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -42,6 +42,25 @@ PY
 
 "$NODE" "$GEN" --input "$FIXTURE" --output "$TMP_DIR/preprinted-minimum.docx" --format formal --letterhead preprinted --letterhead-reserve-mm 37 --doc-no "示例发〔2026〕7号" --title "最小预印留白测试"
 "$NODE" "$VERIFY" --input "$TMP_DIR/preprinted-minimum.docx" --profile formal --letterhead preprinted
+python3 - "$TMP_DIR/preprinted-minimum.docx" "$TMP_DIR/preprinted-malformed.docx" <<'PY'
+import sys, zipfile
+source, target = sys.argv[1:]
+with zipfile.ZipFile(source) as src, zipfile.ZipFile(target, 'w', zipfile.ZIP_DEFLATED) as dst:
+    for item in src.infolist():
+        data = src.read(item.filename)
+        if item.filename == 'word/document.xml':
+            text = data.decode()
+            old = '<w:spacing w:before="0" w:after="0" w:line="1" w:lineRule="exact"/>'
+            assert text.count(old) == 1
+            text = text.replace(old, '<w:spacing w:before="0" w:after="0" w:line="560" w:lineRule="exact"/>', 1)
+            data = text.encode()
+        dst.writestr(item, data)
+PY
+if "$NODE" "$VERIFY" --input "$TMP_DIR/preprinted-malformed.docx" --profile formal >"$TMP_DIR/preprinted-malformed.out" 2>&1; then
+  echo "malformed preprinted reserve unexpectedly passed" >&2
+  exit 1
+fi
+grep -q 'Preprinted letterhead reserve' "$TMP_DIR/preprinted-malformed.out"
 
 "$NODE" "$GEN" --input "$FIXTURE" --output "$TMP_DIR/digital.docx" --format formal --letterhead digital --org "示例单位文件" --doc-no "示例发〔2026〕1号" --title "电子红头测试" --page-number standard
 "$NODE" "$VERIFY" --input "$TMP_DIR/digital.docx" --profile formal --letterhead digital